The article suggests four types of tasks for cognitive-search classroom students' independent work on the subject "Methods of fractal analysis". The authors presented simple and complex variants of each tasks, showed relationship of tasks with general cultural and professional competences of bachelor degree program (221700.62).
The paper studies the influence of citrate and oxalates - ions on kinetics of dissolution of manganese dioxide. It is found that the speed of dissolution increases along with concentration of citric and oxalic acids. Orders on citrate and to oxalates - ions are designed. The empirical formulas describing dependence of speed of dissolution from concentration of the specified acids are offered. In order to obtain the optimal modes of leaching of manganous oxide from anthropogenic raw material the authors investigate the influence рН on the speed of MnO2 dissolution in oxalic acid.
The possibility of red mud (waste of aluminum production) use as an alternative sorbent of molybdate, phosphate and bichromate ions from water solutions was studied. The paper shows dependence of adsorption of these ions from pH and concentration of electrolyte. The way of activation of a red mud surface was developed.
Dependences of dissolution speeds of various titanates from sulfuric acid concentration are investigated. The equation describing kinetic curves of ilmenite dissolution is offered. The method, allowing to receive titanium dioxide from ilmenite in sulfuric acid of concentration 0.1 mole per liter is found.
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